Worse, it's half an hour away from another international airport (ONT), which is already pretty empty. So it seems highly unlikely that any sane airline would ever start service to SBD.
I think it must have one flight to Canadia or something, I'm not sure how else it would get the 'International' moniker.
"a 12,000 square meter terminal building, 12 check-in counters, two gates, a runway long enough to handle the largest commercial jets, and capacity for one million passengers per year"
It was funded by Chinese companies trying to invest in large infrastructure projects, and partly the fault of the dictator of Sri Lanka, who was recently displaced.